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(No Model.) 2 Sheets-Sheet I. v

P. T. SELANDER.

ADJUSTABLE SCHOOL DESK.

No. 406,180 Patented July 2, 1889.

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(NoModeL), 2 Sheets-Sheet 2. F. T. SELANDER. ADJUSTABLE SCHOOL DESK. No. 406,180. PatentedJuly Z, 1889.

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FRANS THEODOR SELANDER, OF GOTHENBURG, SWVEDEN.

ADJUSTABLE SCHOOL-DESK.

SPECIFICATION forming part of Letters Patent No. 406,180, dated July 2, 1889.

Application filedAurustl5,1888. Serial No. 282,782. (No model.) Patented in Sweden April 16, 1888, No. 1,539: England July 23, 1888,11'0. 10,640; in Norway July 26, 1888,1110. 1,048; in France July 26,1888, No. 192,047, andin Belgium July 27,

To all whom it may concern.-

Be it known that I, FRANS THEODOR 8111-, LANDER, a subject of the King of Sweden, residing at Gothenburg, Sweden, have invented certain Improvements in Adjustable School-Desks, of which the following is a specification, and for which patents have been granted in Sweden, No. 1,539, dated April 16, 1888; in Norway, No. 1,048, dated July 26, 1888; in England, No. 10,640, dated July 23, 1888; in France, No. 192,047, dated July 26, 1888, and in Belgium, No. 82,718, dated July 27, 1888.

My invention relates to that class of desks for use in the school-room wherein the desk proper is combined with a seat for the pupil while preparing his lessons; and it has for its object to improve the construction of such desks, so as to render them readily adjustable to pupils of different ages and sizes.

My invention will be fully described hereinafter, and its novel features carefully defined in the claims.

In the drawings which serve to illustrate my invention, Figure l is a side elevation of a school-desk embodying my improvements, and Fig. 2 is a rear elevation of the same. Fig. 3 is a plan view of the desk, and Fig. 1 is a cross-section of the seat on the dotted line a b in Fig. 3. Fig. 5 is a cross-section of a part of the desk-top; and Fig. 6 is a detail, which Will be hereinafter described. These views are on a scale double that of the principal figures.

X is the frame-like base to which the desk and seat are secured. Y are the standards of the desk, and Z the standards that support the seat. On the rear tie of the base X, between the seat-standards Z, is a slotted guidebar U, and on the inner faces of the standards Z and Y, respectively, are parallel oblique guides T and T A foot-rest T is arranged between these guides, being provided with notches which engage them. On the under side of the foot-rest T is a nut I, through which plays a clamping-screw U. This screw passes through the slot in the guide-bar U, and is provided with a head, whereby it may be rotated. By raising the foot rest and then tightening the clamping-screw U any desired elevation of the former maybe obtained. Between the seat-standards is arranged a stay or cross-piece J, to which also the upper end of the guide-bar U is secured. Above this cross-piece J, on the inner faces of the standards Z, are upright. guides P P in which plays a slide-block or cross-head P, on which the seat is mounted. This slide-block P is provided at its middle part with a lag-nut, in which plays an adjustingscrew P, the head of which rests on the upper face of the crosspiece J. By rotating the screw P the slideblock P, carrying the seat, may be adjusted vertically as desired. On the front side of block P, near its ends, are lugs R, which provide bearings for the pivotsQ of the seat. By means of these pivots the seat may be turned up, as in ordinary school-desks.

The seat itself is composed of two parts, a main part M and an extension N. The extension N of the seat plays over the main part M, and is provided with tongues 01, which match grooves m in the main part M of-the seat, somewhat in the manner of dovetailing, and these tongues hold the parts of the seat together. This construction is best seen in Fig. 4. On the under side of the main part M of the seat, is an adj listing-screw, which passes through a nut on the rear edge of the extension N, and is collared in bearings at the front and rear edges of the part M of the seat, as clearly seen in Fig. 1. By rotating this screw the extension N may be caused to play over the main part M of the seat, thus making the seat shallower or deeper, as desired.

The seat-standards Z extend up and support the back Z of the seat. On the rear face of the back Z is a clamp S, which adjustably supports a head-rest S. i

I will now describe my improvements in the desk proper, by means of which I render it the desk-top toward or from the pupil, I provide the following-described device, special reference being had to Figs. 3, 5, and 6. As the same device is employed at each side of the desk, a description of that at one side will suifice for both. ()11 the top of the standard Y is secured a strip E, preferably of metal, and on the inside of the front part I3 of the desk-top is secured a clip D, provided with a notch, which engages the edge of the strip E and allows the desk-top to slide to and fro on the standard, at the same time holding it seeurely down thereto. This clip is best seen in Fig. 6, which shows it in side and end elevation. In order to lock the desk-top against movement when properly adjusted, I mount on the outer face of the standard Y a slotted guide-plate G, in which plays a T-headed bolt F, provided with a nut F on its inner end. The plate G is provided on its inner face with guides, between which the nut F rests and plays, and whereby it is held against rotation. The bolt F is loosened by turning it a little, moved along the slot in plate G to the proper point, and then set fast. Then the desk-top is slid along until a notch in a lug II on the hinged part thereof coincides with the T-head of the bolt F, when the said hinged part is lifted and the notched lug is made to engage and take over said bolt, thus holding or clamping the desk-top against movement.

I prefer to provide the hinged partAof the desk-top with a panel I, pivoted at K, and provided with braces or props L, which fit into grooves or recesses at its sides. This, when raised, as seen in dotted lines in Fig. 1, provides a convenient book-rest during study.

It is evident that some alterations may be made in the construction shown in the drawings without departing materially from my invention, and therefore I do not wish to limit myself to the precise construction and arrangement shown.

Having thus described my invention, I claim 1. In an adjustable school-desk, the combination, with the standards, of the desk-top mounted in guides thereon, and the looking or stop device for the desktop, said device consisting of the slotted guide-plate G on the standard, the T-headed bolt F in said slot, the nut F, into which said bolt is screwed, and the notched lug II on the desk-top, arranged to engage said bolt, substantially as set forth.

2. I11 an adjustable sch0ol-desk,the combination, with the seat-supports, of the seat constructed of two parts, the one part provided with tongues matching with grooves in the other part, and with an adjusting-screw collared at its ends in bearings on one part and passing through a nut on the other part, whereby rotation of said screw causes one part to play over the other.

In an adjustable school-desk,t11e combination, with the seat--standards and the deskstandards provided with parallel inclined guides, and the slotted guide-bar U between said seatstandards, of a foot-rest mounted in said guides and provided with a nut, and a clamping-screw passing through said nut on the foot-rest, and also through the slot in said guide-bar, whereby said foot-rest may be supported at any desired elevation on the guides, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

FRANS TIIEODOR SELANDER.

\Vitnesses:

H. M. ULESBERGREN, F. lIELLsTRoM. 

